Problems storing image url in database on upload (CodeIgniter) - mysql

Question

This is widely discussed topic:how to save image url in database on upload?
I have read them but still can not understand why my controller is not working. I followed CodeIgniters documentation on uploading files and created controler that uploads file in desired directory, so far so good. I now want to save image url in database on upload. I modified code from this question but I have multiple errors that I can not get around.
1.
Message: Illegal string offset 'file_name'
Filename: controllers/Upload.php
Line Number: 36
2.Message: Undefined property: Upload::$db
Filename: controllers/Upload.php
Line Number: 37
3.Message: Call to a member function insert() on null
Filename: controllers/Upload.php
Line Number: 37
Here is my controller(I have test table puzz with two fields - auto increment primary key id and image_url):
<?php
class Upload extends CI_Controller {
public function __construct()
{
parent::__construct();
$this->load->helper(array('form', 'url'));
}
public function index()
{
$this->load->view('upload_form', array('error' => ' ' ));
}
public function do_upload()
{
$config['upload_path'] = './uploads/';
$config['allowed_types'] = 'gif|jpg|png';
$config['max_size'] = 100;
$config['max_width'] = 1024;
$config['max_height'] = 768;
$this->load->library('upload', $config);
if ( ! $this->upload->do_upload('userfile'))
{
$error = array('error' => $this->upload->display_errors());
$this->load->view('upload_form', $error);
}
else
{
$data = $this->upload->data();
$file_array = $this->upload->data('file_name');
$image['image_url'] = $file_array['file_name'];
$this->db->insert('puzz', $image);
$this->load->view('upload_success', $data);
}
}
}
?>
Will appreciate if someone could point to wrongs in my code!

Answer 1

add this before using insert
$this->load->database();
OR change constructor
public function __construct()
{
parent::__construct();
$this->load->helper(array('form', 'url'));
$this->load->database();
}
OR change in autoload.php
$autoload['libraries'] = array('database');
AND change this code block to
$data = $this->upload->data();
$image['image_url'] = $data['file_name'];
$this->db->insert('puzz', $image);
$this->load->view('upload_success', $data);